#include <algorithm>
#include <array>
#include <cassert>
#include <chrono>
#include <cinttypes>
#include <clocale>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <iterator>
#include <map>
#include <numeric>
#include <regex>
#include <sstream>
#include <string>
#include <vector>

#include "ggml.h"
#include "llama.h"
#include "common.h"
#include "ggml-cuda.h"
#include "ggml-sycl.h"

// utils
static uint64_t get_time_ns() {
    using clock = std::chrono::high_resolution_clock;
    return std::chrono::nanoseconds(clock::now().time_since_epoch()).count();
}

template<class T>
static std::string join(const std::vector<T> & values, const std::string & delim) {
    std::ostringstream str;
    for (size_t i = 0; i < values.size(); i++) {
        str << values[i];
        if (i < values.size() - 1) {
            str << delim;
        }
    }
    return str.str();
}

template<typename T, typename F>
static std::vector<std::string> transform_to_str(const std::vector<T> & values, F f) {
    std::vector<std::string> str_values;
    std::transform(values.begin(), values.end(), std::back_inserter(str_values), f);
    return str_values;
}

template<typename T>
static T avg(const std::vector<T> & v) {
    if (v.empty()) {
        return 0;
    }
    T sum = std::accumulate(v.begin(), v.end(), T(0));
    return sum / (T)v.size();
}

template<typename T>
static T stdev(const std::vector<T> & v) {
    if (v.size() <= 1) {
        return 0;
    }
    T mean = avg(v);
    T sq_sum = std::inner_product(v.begin(), v.end(), v.begin(), T(0));
    T stdev = std::sqrt(sq_sum / (T)(v.size() - 1) - mean * mean * (T)v.size() / (T)(v.size() - 1));
    return stdev;
}

static std::string get_cpu_info() {
    std::string id;
#ifdef __linux__
    FILE * f = fopen("/proc/cpuinfo", "r");
    if (f) {
        char buf[1024];
        while (fgets(buf, sizeof(buf), f)) {
            if (strncmp(buf, "model name", 10) == 0) {
                char * p = strchr(buf, ':');
                if (p) {
                    p++;
                    while (std::isspace(*p)) {
                        p++;
                    }
                    while (std::isspace(p[strlen(p) - 1])) {
                        p[strlen(p) - 1] = '\0';
                    }
                    id = p;
                    break;
                }
            }
        }
        fclose(f);
    }
#endif
    // TODO: other platforms
    return id;
}

static std::string get_gpu_info() {
    std::string id;
#ifdef GGML_USE_CUDA
    int count = ggml_backend_cuda_get_device_count();
    for (int i = 0; i < count; i++) {
        char buf[128];
        ggml_backend_cuda_get_device_description(i, buf, sizeof(buf));
        id += buf;
        if (i < count - 1) {
            id += "/";
        }
    }
#endif
#ifdef GGML_USE_SYCL
    int count = ggml_backend_sycl_get_device_count();
    for (int i = 0; i < count; i++) {
        char buf[128];
        ggml_sycl_get_device_description(i, buf, sizeof(buf));
        id += buf;
        if (i < count - 1) {
            id += "/";
        }
    }
#endif
    // TODO: other backends
    return id;
}

// command line params
enum output_formats {NONE, CSV, JSON, MARKDOWN, SQL};

static const char * output_format_str(output_formats format) {
    switch (format) {
        case NONE:     return "none";
        case CSV:      return "csv";
        case JSON:     return "json";
        case MARKDOWN: return "md";
        case SQL:      return "sql";
        default: GGML_ASSERT(!"invalid output format");
    }
}

static bool output_format_from_str(const std::string & s, output_formats & format) {
    if (s == "none") {
        format = NONE;
    } else if (s == "csv") {
        format = CSV;
    } else if (s == "json") {
        format = JSON;
    } else if (s == "md") {
        format = MARKDOWN;
    } else if (s == "sql") {
        format = SQL;
    } else {
        return false;
    }
    return true;
}

static const char * split_mode_str(llama_split_mode mode) {
    switch (mode) {
        case LLAMA_SPLIT_MODE_NONE:  return "none";
        case LLAMA_SPLIT_MODE_LAYER: return "layer";
        case LLAMA_SPLIT_MODE_ROW:   return "row";
        default: GGML_ASSERT(!"invalid split mode");
    }
}

static std::string pair_str(const std::pair<int, int> & p) {
    static char buf[32];
    snprintf(buf, sizeof(buf), "%d,%d", p.first, p.second);
    return buf;
}

struct cmd_params {
    std::vector<std::string> model;
    std::vector<int> n_prompt;
    std::vector<int> n_gen;
    std::vector<std::pair<int, int>> n_pg;
    std::vector<int> n_batch;
    std::vector<int> n_ubatch;
    std::vector<ggml_type> type_k;
    std::vector<ggml_type> type_v;
    std::vector<int> n_threads;
    std::vector<int> n_gpu_layers;
    std::vector<std::string> rpc_servers;
    std::vector<llama_split_mode> split_mode;
    std::vector<int> main_gpu;
    std::vector<bool> no_kv_offload;
    std::vector<bool> flash_attn;
    std::vector<std::vector<float>> tensor_split;
    std::vector<bool> use_mmap;
    std::vector<bool> embeddings;
    ggml_numa_strategy numa;
    int reps;
    bool verbose;
    output_formats output_format;
    output_formats output_format_stderr;
};

static const cmd_params cmd_params_defaults = {
    /* model                */ {"models/7B/ggml-model-q4_0.gguf"},
    /* n_prompt             */ {512},
    /* n_gen                */ {128},
    /* n_pg                 */ {},
    /* n_batch              */ {2048},
    /* n_ubatch             */ {512},
    /* type_k               */ {GGML_TYPE_F16},
    /* type_v               */ {GGML_TYPE_F16},
    /* n_threads            */ {cpu_get_num_math()},
    /* n_gpu_layers         */ {99},
    /* rpc_servers          */ {""},
    /* split_mode           */ {LLAMA_SPLIT_MODE_LAYER},
    /* main_gpu             */ {0},
    /* no_kv_offload        */ {false},
    /* flash_attn           */ {false},
    /* tensor_split         */ {std::vector<float>(llama_max_devices(), 0.0f)},
    /* use_mmap             */ {true},
    /* embeddings           */ {false},
    /* numa                 */ GGML_NUMA_STRATEGY_DISABLED,
    /* reps                 */ 5,
    /* verbose              */ false,
    /* output_format        */ MARKDOWN,
    /* output_format_stderr */ NONE,
};

static void print_usage(int /* argc */, char ** argv) {
    printf("usage: %s [options]\n", argv[0]);
    printf("\n");
    printf("options:\n");
    printf("  -h, --help\n");
    printf("  -m, --model <filename>              (default: %s)\n", join(cmd_params_defaults.model, ",").c_str());
    printf("  -p, --n-prompt <n>                  (default: %s)\n", join(cmd_params_defaults.n_prompt, ",").c_str());
    printf("  -n, --n-gen <n>                     (default: %s)\n", join(cmd_params_defaults.n_gen, ",").c_str());
    printf("  -pg <pp,tg>                         (default: %s)\n", join(transform_to_str(cmd_params_defaults.n_pg, pair_str), ",").c_str());
    printf("  -b, --batch-size <n>                (default: %s)\n", join(cmd_params_defaults.n_batch, ",").c_str());
    printf("  -ub, --ubatch-size <n>              (default: %s)\n", join(cmd_params_defaults.n_ubatch, ",").c_str());
    printf("  -ctk, --cache-type-k <t>            (default: %s)\n", join(transform_to_str(cmd_params_defaults.type_k, ggml_type_name), ",").c_str());
    printf("  -ctv, --cache-type-v <t>            (default: %s)\n", join(transform_to_str(cmd_params_defaults.type_v, ggml_type_name), ",").c_str());
    printf("  -t, --threads <n>                   (default: %s)\n", join(cmd_params_defaults.n_threads, ",").c_str());
    printf("  -ngl, --n-gpu-layers <n>            (default: %s)\n", join(cmd_params_defaults.n_gpu_layers, ",").c_str());
    printf("  -rpc, --rpc <rpc_servers>           (default: %s)\n", join(cmd_params_defaults.rpc_servers, ",").c_str());
    printf("  -sm, --split-mode <none|layer|row>  (default: %s)\n", join(transform_to_str(cmd_params_defaults.split_mode, split_mode_str), ",").c_str());
    printf("  -mg, --main-gpu <i>                 (default: %s)\n", join(cmd_params_defaults.main_gpu, ",").c_str());
    printf("  -nkvo, --no-kv-offload <0|1>        (default: %s)\n", join(cmd_params_defaults.no_kv_offload, ",").c_str());
    printf("  -fa, --flash-attn <0|1>             (default: %s)\n", join(cmd_params_defaults.flash_attn, ",").c_str());
    printf("  -mmp, --mmap <0|1>                  (default: %s)\n", join(cmd_params_defaults.use_mmap, ",").c_str());
    printf("  --numa <distribute|isolate|numactl> (default: disabled)\n");
    printf("  -embd, --embeddings <0|1>           (default: %s)\n", join(cmd_params_defaults.embeddings, ",").c_str());
    printf("  -ts, --tensor-split <ts0/ts1/..>    (default: 0)\n");
    printf("  -r, --repetitions <n>               (default: %d)\n", cmd_params_defaults.reps);
    printf("  -o, --output <csv|json|md|sql>      (default: %s)\n", output_format_str(cmd_params_defaults.output_format));
    printf("  -oe, --output-err <csv|json|md|sql> (default: %s)\n", output_format_str(cmd_params_defaults.output_format_stderr));
    printf("  -v, --verbose                       (default: %s)\n", cmd_params_defaults.verbose ? "1" : "0");
    printf("\n");
    printf("Multiple values can be given for each parameter by separating them with ',' or by specifying the parameter multiple times.\n");
}

static ggml_type ggml_type_from_name(const std::string & s) {
    if (s == "f16") {
        return GGML_TYPE_F16;
    }
    if (s == "q8_0") {
        return GGML_TYPE_Q8_0;
    }
    if (s == "q4_0") {
        return GGML_TYPE_Q4_0;
    }
    if (s == "q4_1") {
        return GGML_TYPE_Q4_1;
    }
    if (s == "q5_0") {
        return GGML_TYPE_Q5_0;
    }
    if (s == "q5_1") {
        return GGML_TYPE_Q5_1;
    }
    if (s == "iq4_nl") {
        return GGML_TYPE_IQ4_NL;
    }

    return GGML_TYPE_COUNT;
}


static cmd_params parse_cmd_params(int argc, char ** argv) {
    cmd_params params;
    std::string arg;
    bool invalid_param = false;
    const std::string arg_prefix = "--";
    const char split_delim = ',';

    params.verbose = cmd_params_defaults.verbose;
    params.output_format = cmd_params_defaults.output_format;
    params.output_format_stderr = cmd_params_defaults.output_format_stderr;
    params.reps = cmd_params_defaults.reps;
    params.numa = cmd_params_defaults.numa;

    for (int i = 1; i < argc; i++) {
        arg = argv[i];
        if (arg.compare(0, arg_prefix.size(), arg_prefix) == 0) {
            std::replace(arg.begin(), arg.end(), '_', '-');
        }

        if (arg == "-h" || arg == "--help") {
            print_usage(argc, argv);
            exit(0);
        } else if (arg == "-m" || arg == "--model") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<std::string>(argv[i], split_delim);
            params.model.insert(params.model.end(), p.begin(), p.end());
        } else if (arg == "-p" || arg == "--n-prompt") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<int>(argv[i], split_delim);
            params.n_prompt.insert(params.n_prompt.end(), p.begin(), p.end());
        } else if (arg == "-n" || arg == "--n-gen") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<int>(argv[i], split_delim);
            params.n_gen.insert(params.n_gen.end(), p.begin(), p.end());
        } else if (arg == "-pg") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<std::string>(argv[i], ',');
            if (p.size() != 2) {
                invalid_param = true;
                break;
            }
            params.n_pg.push_back({std::stoi(p[0]), std::stoi(p[1])});
        } else if (arg == "-b" || arg == "--batch-size") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<int>(argv[i], split_delim);
            params.n_batch.insert(params.n_batch.end(), p.begin(), p.end());
        } else if (arg == "-ub" || arg == "--ubatch-size") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<int>(argv[i], split_delim);
            params.n_ubatch.insert(params.n_ubatch.end(), p.begin(), p.end());
        } else if (arg == "-ctk" || arg == "--cache-type-k") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<std::string>(argv[i], split_delim);
            std::vector<ggml_type> types;
            for (const auto & t : p) {
                ggml_type gt = ggml_type_from_name(t);
                if (gt == GGML_TYPE_COUNT) {
                    invalid_param = true;
                    break;
                }
                types.push_back(gt);
            }
            params.type_k.insert(params.type_k.end(), types.begin(), types.end());
        } else if (arg == "-ctv" || arg == "--cache-type-v") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<std::string>(argv[i], split_delim);
            std::vector<ggml_type> types;
            for (const auto & t : p) {
                ggml_type gt = ggml_type_from_name(t);
                if (gt == GGML_TYPE_COUNT) {
                    invalid_param = true;
                    break;
                }
                types.push_back(gt);
            }
            params.type_v.insert(params.type_v.end(), types.begin(), types.end());
        } else if (arg == "-t" || arg == "--threads") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<int>(argv[i], split_delim);
            params.n_threads.insert(params.n_threads.end(), p.begin(), p.end());
        } else if (arg == "-ngl" || arg == "--n-gpu-layers") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<int>(argv[i], split_delim);
            params.n_gpu_layers.insert(params.n_gpu_layers.end(), p.begin(), p.end());
        } else if (arg == "-rpc" || arg == "--rpc") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            params.rpc_servers.push_back(argv[i]);
        } else if (arg == "-sm" || arg == "--split-mode") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<std::string>(argv[i], split_delim);
            std::vector<llama_split_mode> modes;
            for (const auto & m : p) {
                llama_split_mode mode;
                if (m == "none") {
                    mode = LLAMA_SPLIT_MODE_NONE;
                } else if (m == "layer") {
                    mode = LLAMA_SPLIT_MODE_LAYER;
                } else if (m == "row") {
                    mode = LLAMA_SPLIT_MODE_ROW;
                } else {
                    invalid_param = true;
                    break;
                }
                modes.push_back(mode);
            }
            params.split_mode.insert(params.split_mode.end(), modes.begin(), modes.end());
        } else if (arg == "-mg" || arg == "--main-gpu") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            params.main_gpu = string_split<int>(argv[i], split_delim);
        } else if (arg == "-nkvo" || arg == "--no-kv-offload") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<bool>(argv[i], split_delim);
            params.no_kv_offload.insert(params.no_kv_offload.end(), p.begin(), p.end());
        } else if (arg == "--numa") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            } else {
                std::string value(argv[i]);
                /**/ if (value == "distribute" || value == "" ) { params.numa = GGML_NUMA_STRATEGY_DISTRIBUTE; }
                else if (value == "isolate")                    { params.numa = GGML_NUMA_STRATEGY_ISOLATE; }
                else if (value == "numactl")                    { params.numa = GGML_NUMA_STRATEGY_NUMACTL; }
                else { invalid_param = true; break; }
            }
        } else if (arg == "-fa" || arg == "--flash-attn") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<bool>(argv[i], split_delim);
            params.flash_attn.insert(params.flash_attn.end(), p.begin(), p.end());
        } else if (arg == "-mmp" || arg == "--mmap") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<bool>(argv[i], split_delim);
            params.use_mmap.insert(params.use_mmap.end(), p.begin(), p.end());
        } else if (arg == "-embd" || arg == "--embeddings") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            auto p = string_split<bool>(argv[i], split_delim);
            params.embeddings.insert(params.embeddings.end(), p.begin(), p.end());
        } else if (arg == "-ts" || arg == "--tensor-split") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            for (auto ts : string_split<std::string>(argv[i], split_delim)) {
                // split string by ; and /
                const std::regex regex{R"([;/]+)"};
                std::sregex_token_iterator it{ts.begin(), ts.end(), regex, -1};
                std::vector<std::string> split_arg{it, {}};
                GGML_ASSERT(split_arg.size() <= llama_max_devices());

                std::vector<float> tensor_split(llama_max_devices());
                for (size_t i = 0; i < llama_max_devices(); ++i) {
                    if (i < split_arg.size()) {
                        tensor_split[i] = std::stof(split_arg[i]);
                    } else {
                        tensor_split[i] = 0.0f;
                    }
                }
                params.tensor_split.push_back(tensor_split);
            }
        } else if (arg == "-r" || arg == "--repetitions") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            params.reps = std::stoi(argv[i]);
        } else if (arg == "-o" || arg == "--output") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            invalid_param = !output_format_from_str(argv[i], params.output_format);
        } else if (arg == "-oe" || arg == "--output-err") {
            if (++i >= argc) {
                invalid_param = true;
                break;
            }
            invalid_param = !output_format_from_str(argv[i], params.output_format_stderr);
        } else if (arg == "-v" || arg == "--verbose") {
            params.verbose = true;
        } else {
            invalid_param = true;
            break;
        }
    }
    if (invalid_param) {
        fprintf(stderr, "error: invalid parameter for argument: %s\n", arg.c_str());
        print_usage(argc, argv);
        exit(1);
    }

    // set defaults
    if (params.model.empty())        { params.model = cmd_params_defaults.model; }
    if (params.n_prompt.empty())     { params.n_prompt = cmd_params_defaults.n_prompt; }
    if (params.n_gen.empty())        { params.n_gen = cmd_params_defaults.n_gen; }
    if (params.n_pg.empty())         { params.n_pg = cmd_params_defaults.n_pg; }
    if (params.n_batch.empty())      { params.n_batch = cmd_params_defaults.n_batch; }
    if (params.n_ubatch.empty())     { params.n_ubatch = cmd_params_defaults.n_ubatch; }
    if (params.type_k.empty())       { params.type_k = cmd_params_defaults.type_k; }
    if (params.type_v.empty())       { params.type_v = cmd_params_defaults.type_v; }
    if (params.n_gpu_layers.empty()) { params.n_gpu_layers = cmd_params_defaults.n_gpu_layers; }
    if (params.rpc_servers.empty())  { params.rpc_servers = cmd_params_defaults.rpc_servers; }
    if (params.split_mode.empty())   { params.split_mode = cmd_params_defaults.split_mode; }
    if (params.main_gpu.empty())     { params.main_gpu = cmd_params_defaults.main_gpu; }
    if (params.no_kv_offload.empty()){ params.no_kv_offload = cmd_params_defaults.no_kv_offload; }
    if (params.flash_attn.empty())   { params.flash_attn = cmd_params_defaults.flash_attn; }
    if (params.tensor_split.empty()) { params.tensor_split = cmd_params_defaults.tensor_split; }
    if (params.use_mmap.empty())     { params.use_mmap = cmd_params_defaults.use_mmap; }
    if (params.embeddings.empty())   { params.embeddings = cmd_params_defaults.embeddings; }
    if (params.n_threads.empty())    { params.n_threads = cmd_params_defaults.n_threads; }

    return params;
}

struct cmd_params_instance {
    std::string model;
    int n_prompt;
    int n_gen;
    int n_batch;
    int n_ubatch;
    ggml_type type_k;
    ggml_type type_v;
    int n_threads;
    int n_gpu_layers;
    std::string rpc_servers;
    llama_split_mode split_mode;
    int main_gpu;
    bool no_kv_offload;
    bool flash_attn;
    std::vector<float> tensor_split;
    bool use_mmap;
    bool embeddings;

    llama_model_params to_llama_mparams() const {
        llama_model_params mparams = llama_model_default_params();

        mparams.n_gpu_layers = n_gpu_layers;
        if (!rpc_servers.empty()) {
            mparams.rpc_servers = rpc_servers.c_str();
        }
        mparams.split_mode = split_mode;
        mparams.main_gpu = main_gpu;
        mparams.tensor_split = tensor_split.data();
        mparams.use_mmap = use_mmap;

        return mparams;
    }

    bool equal_mparams(const cmd_params_instance & other) const {
        return model == other.model &&
               n_gpu_layers == other.n_gpu_layers &&
               rpc_servers == other.rpc_servers &&
               split_mode == other.split_mode &&
               main_gpu == other.main_gpu &&
               use_mmap == other.use_mmap &&
               tensor_split == other.tensor_split;
    }

    llama_context_params to_llama_cparams() const {
        llama_context_params cparams = llama_context_default_params();

        cparams.n_ctx = n_prompt + n_gen;
        cparams.n_batch = n_batch;
        cparams.n_ubatch = n_ubatch;
        cparams.type_k = type_k;
        cparams.type_v = type_v;
        cparams.offload_kqv = !no_kv_offload;
        cparams.flash_attn = flash_attn;
        cparams.embeddings = embeddings;

        return cparams;
    }
};

static std::vector<cmd_params_instance> get_cmd_params_instances(const cmd_params & params) {
    std::vector<cmd_params_instance> instances;

    // this ordering minimizes the number of times that each model needs to be reloaded
    for (const auto & m : params.model)
    for (const auto & nl : params.n_gpu_layers)
    for (const auto & rpc : params.rpc_servers)
    for (const auto & sm : params.split_mode)
    for (const auto & mg : params.main_gpu)
    for (const auto & ts : params.tensor_split)
    for (const auto & mmp : params.use_mmap)
    for (const auto & embd : params.embeddings)
    for (const auto & nb : params.n_batch)
    for (const auto & nub : params.n_ubatch)
    for (const auto & tk : params.type_k)
    for (const auto & tv : params.type_v)
    for (const auto & nkvo : params.no_kv_offload)
    for (const auto & fa : params.flash_attn)
    for (const auto & nt : params.n_threads) {
        for (const auto & n_prompt : params.n_prompt) {
            if (n_prompt == 0) {
                continue;
            }
            cmd_params_instance instance = {
                /* .model        = */ m,
                /* .n_prompt     = */ n_prompt,
                /* .n_gen        = */ 0,
                /* .n_batch      = */ nb,
                /* .n_ubatch     = */ nub,
                /* .type_k       = */ tk,
                /* .type_v       = */ tv,
                /* .n_threads    = */ nt,
                /* .n_gpu_layers = */ nl,
                /* .rpc_servers  = */ rpc,
                /* .split_mode   = */ sm,
                /* .main_gpu     = */ mg,
                /* .no_kv_offload= */ nkvo,
                /* .flash_attn   = */ fa,
                /* .tensor_split = */ ts,
                /* .use_mmap     = */ mmp,
                /* .embeddings   = */ embd,
            };
            instances.push_back(instance);
        }

        for (const auto & n_gen : params.n_gen) {
            if (n_gen == 0) {
                continue;
            }
            cmd_params_instance instance = {
                /* .model        = */ m,
                /* .n_prompt     = */ 0,
                /* .n_gen        = */ n_gen,
                /* .n_batch      = */ nb,
                /* .n_ubatch     = */ nub,
                /* .type_k       = */ tk,
                /* .type_v       = */ tv,
                /* .n_threads    = */ nt,
                /* .n_gpu_layers = */ nl,
                /* .rpc_servers  = */ rpc,
                /* .split_mode   = */ sm,
                /* .main_gpu     = */ mg,
                /* .no_kv_offload= */ nkvo,
                /* .flash_attn   = */ fa,
                /* .tensor_split = */ ts,
                /* .use_mmap     = */ mmp,
                /* .embeddings   = */ embd,
            };
            instances.push_back(instance);
        }

        for (const auto & n_pg : params.n_pg) {
            if (n_pg.first == 0 && n_pg.second == 0) {
                continue;
            }
            cmd_params_instance instance = {
                /* .model        = */ m,
                /* .n_prompt     = */ n_pg.first,
                /* .n_gen        = */ n_pg.second,
                /* .n_batch      = */ nb,
                /* .n_ubatch     = */ nub,
                /* .type_k       = */ tk,
                /* .type_v       = */ tv,
                /* .n_threads    = */ nt,
                /* .n_gpu_layers = */ nl,
                /* .rpc_servers  = */ rpc,
                /* .split_mode   = */ sm,
                /* .main_gpu     = */ mg,
                /* .no_kv_offload= */ nkvo,
                /* .flash_attn   = */ fa,
                /* .tensor_split = */ ts,
                /* .use_mmap     = */ mmp,
                /* .embeddings   = */ embd,
            };
            instances.push_back(instance);
        }
    }

    return instances;
}

struct test {
    static const std::string build_commit;
    static const int build_number;
    static const bool cuda;
    static const bool vulkan;
    static const bool kompute;
    static const bool metal;
    static const bool sycl;
    static const bool gpu_blas;
    static const bool blas;
    static const std::string cpu_info;
    static const std::string gpu_info;
    std::string model_filename;
    std::string model_type;
    uint64_t model_size;
    uint64_t model_n_params;
    int n_batch;
    int n_ubatch;
    int n_threads;
    bool has_rpc;
    ggml_type type_k;
    ggml_type type_v;
    int n_gpu_layers;
    llama_split_mode split_mode;
    int main_gpu;
    bool no_kv_offload;
    bool flash_attn;
    std::vector<float> tensor_split;
    bool use_mmap;
    bool embeddings;
    int n_prompt;
    int n_gen;
    std::string test_time;
    std::vector<uint64_t> samples_ns;

    test(const cmd_params_instance & inst, const llama_model * lmodel, const llama_context * ctx) {
        model_filename = inst.model;
        char buf[128];
        llama_model_desc(lmodel, buf, sizeof(buf));
        model_type = buf;
        model_size = llama_model_size(lmodel);
        model_n_params = llama_model_n_params(lmodel);
        n_batch = inst.n_batch;
        n_ubatch = inst.n_ubatch;
        n_threads = inst.n_threads;
        has_rpc = !inst.rpc_servers.empty();
        type_k = inst.type_k;
        type_v = inst.type_v;
        n_gpu_layers = inst.n_gpu_layers;
        split_mode = inst.split_mode;
        main_gpu = inst.main_gpu;
        no_kv_offload = inst.no_kv_offload;
        flash_attn = inst.flash_attn;
        tensor_split = inst.tensor_split;
        use_mmap = inst.use_mmap;
        embeddings = inst.embeddings;
        n_prompt = inst.n_prompt;
        n_gen = inst.n_gen;
        // RFC 3339 date-time format
        time_t t = time(NULL);
        std::strftime(buf, sizeof(buf), "%FT%TZ", gmtime(&t));
        test_time = buf;

        (void) ctx;
    }

    uint64_t avg_ns() const {
        return ::avg(samples_ns);
    }

    uint64_t stdev_ns() const {
        return ::stdev(samples_ns);
    }

    std::vector<double> get_ts() const {
        int n_tokens = n_prompt + n_gen;
        std::vector<double> ts;
        std::transform(samples_ns.begin(), samples_ns.end(), std::back_inserter(ts), [n_tokens](uint64_t t) { return 1e9 * n_tokens / t; });
        return ts;
    }

    double avg_ts() const {
        return ::avg(get_ts());
    }

    double stdev_ts() const {
        return ::stdev(get_ts());
    }

    static std::string get_backend() {
        if (cuda) {
            return GGML_CUDA_NAME;
        }
        if (vulkan) {
            return "Vulkan";
        }
        if (kompute) {
            return "Kompute";
        }
        if (metal) {
            return "Metal";
        }
        if (sycl) {
            return GGML_SYCL_NAME;
        }
        if (gpu_blas) {
            return "GPU BLAS";
        }
        if (blas) {
            return "BLAS";
        }

        return "CPU";
    }

    static const std::vector<std::string> & get_fields() {
        static const std::vector<std::string> fields = {
            "build_commit", "build_number",
            "cuda", "vulkan", "kompute", "metal", "sycl", "rpc", "gpu_blas", "blas",
            "cpu_info", "gpu_info",
            "model_filename", "model_type", "model_size", "model_n_params",
            "n_batch", "n_ubatch",
            "n_threads", "type_k", "type_v",
            "n_gpu_layers", "split_mode",
            "main_gpu", "no_kv_offload", "flash_attn",
            "tensor_split", "use_mmap", "embeddings",
            "n_prompt", "n_gen", "test_time",
            "avg_ns", "stddev_ns",
            "avg_ts", "stddev_ts"
        };
        return fields;
    }

    enum field_type {STRING, BOOL, INT, FLOAT};

    static field_type get_field_type(const std::string & field) {
        if (field == "build_number" || field == "n_batch" || field == "n_ubatch" ||
            field == "n_threads" ||
            field == "model_size" || field == "model_n_params" ||
            field == "n_gpu_layers" || field == "main_gpu" ||
            field == "n_prompt" || field == "n_gen" ||
            field == "avg_ns" || field == "stddev_ns") {
            return INT;
        }
        if (field == "cuda" || field == "vulkan" || field == "kompute" || field == "metal" ||
            field == "gpu_blas" || field == "blas" || field == "sycl" ||field == "f16_kv" || field == "no_kv_offload" ||
            field == "flash_attn" || field == "use_mmap" || field == "embeddings") {
            return BOOL;
        }
        if (field == "avg_ts" || field == "stddev_ts") {
            return FLOAT;
        }
        return STRING;
    }

    std::vector<std::string> get_values() const {
        std::string tensor_split_str;
        int max_nonzero = 0;
        for (size_t i = 0; i < llama_max_devices(); i++) {
            if (tensor_split[i] > 0) {
                max_nonzero = i;
            }
        }
        for (int i = 0; i <= max_nonzero; i++) {
            char buf[32];
            snprintf(buf, sizeof(buf), "%.2f", tensor_split[i]);
            tensor_split_str += buf;
            if (i < max_nonzero) {
                tensor_split_str += "/";
            }
        }
        std::vector<std::string> values = {
            build_commit, std::to_string(build_number),
            std::to_string(cuda), std::to_string(vulkan), std::to_string(vulkan),
            std::to_string(metal), std::to_string(sycl), std::to_string(has_rpc), std::to_string(gpu_blas), std::to_string(blas),
            cpu_info, gpu_info,
            model_filename, model_type, std::to_string(model_size), std::to_string(model_n_params),
            std::to_string(n_batch), std::to_string(n_ubatch),
            std::to_string(n_threads), ggml_type_name(type_k), ggml_type_name(type_v),
            std::to_string(n_gpu_layers), split_mode_str(split_mode),
            std::to_string(main_gpu), std::to_string(no_kv_offload), std::to_string(flash_attn),
            tensor_split_str, std::to_string(use_mmap), std::to_string(embeddings),
            std::to_string(n_prompt), std::to_string(n_gen), test_time,
            std::to_string(avg_ns()), std::to_string(stdev_ns()),
            std::to_string(avg_ts()), std::to_string(stdev_ts())
        };
        return values;
    }

    std::map<std::string, std::string> get_map() const {
        std::map<std::string, std::string> map;
        auto fields = get_fields();
        auto values = get_values();
        std::transform(fields.begin(), fields.end(), values.begin(),
                std::inserter(map, map.end()), std::make_pair<const std::string &, const std::string &>);
        return map;
    }
};

const std::string test::build_commit = LLAMA_COMMIT;
const int         test::build_number = LLAMA_BUILD_NUMBER;
const bool        test::cuda         = !!ggml_cpu_has_cuda();
const bool        test::vulkan       = !!ggml_cpu_has_vulkan();
const bool        test::kompute      = !!ggml_cpu_has_kompute();
const bool        test::metal        = !!ggml_cpu_has_metal();
const bool        test::gpu_blas     = !!ggml_cpu_has_gpublas();
const bool        test::blas         = !!ggml_cpu_has_blas();
const bool        test::sycl         = !!ggml_cpu_has_sycl();
const std::string test::cpu_info     = get_cpu_info();
const std::string test::gpu_info     = get_gpu_info();

struct printer {
    virtual ~printer() {}

    FILE * fout;
    virtual void print_header(const cmd_params & params) { (void) params; }
    virtual void print_test(const test & t) = 0;
    virtual void print_footer() { }
};

struct csv_printer : public printer {
    static std::string escape_csv(const std::string & field) {
        std::string escaped = "\"";
        for (auto c : field) {
            if (c == '"') {
                escaped += "\"";
            }
            escaped += c;
        }
        escaped += "\"";
        return escaped;
    }

    void print_header(const cmd_params & params) override  {
        std::vector<std::string> fields = test::get_fields();
        fprintf(fout, "%s\n", join(fields, ",").c_str());
        (void) params;
    }

    void print_test(const test & t) override {
        std::vector<std::string> values = t.get_values();
        std::transform(values.begin(), values.end(), values.begin(), escape_csv);
        fprintf(fout, "%s\n", join(values, ",").c_str());
    }
};

struct json_printer : public printer {
    bool first = true;

    static std::string escape_json(const std::string & value) {
        std::string escaped;
        for (auto c : value) {
            if (c == '"') {
                escaped += "\\\"";
            } else if (c == '\\') {
                escaped += "\\\\";
            } else  if (c <= 0x1f) {
                char buf[8];
                snprintf(buf, sizeof(buf), "\\u%04x", c);
                escaped += buf;
            } else {
                escaped += c;
            }
        }
        return escaped;
    }

    static std::string format_value(const std::string & field, const std::string & value) {
        switch (test::get_field_type(field)) {
            case test::STRING:
                return "\"" + escape_json(value) + "\"";
            case test::BOOL:
                return value == "0" ? "false" : "true";
            default:
                return value;
        }
    }

    void print_header(const cmd_params & params) override {
        fprintf(fout, "[\n");
        (void) params;
    }

    void print_fields(const std::vector<std::string> & fields, const std::vector<std::string> & values) {
        assert(fields.size() == values.size());
        for (size_t i = 0; i < fields.size(); i++) {
            fprintf(fout, "    \"%s\": %s,\n", fields.at(i).c_str(), format_value(fields.at(i), values.at(i)).c_str());
        }
    }

    void print_test(const test & t) override {
        if (first) {
            first = false;
        } else {
            fprintf(fout, ",\n");
        }
        fprintf(fout, "  {\n");
        print_fields(test::get_fields(), t.get_values());
        fprintf(fout, "    \"samples_ns\": [ %s ],\n", join(t.samples_ns, ", ").c_str());
        fprintf(fout, "    \"samples_ts\": [ %s ]\n", join(t.get_ts(), ", ").c_str());
        fprintf(fout, "  }");
        fflush(fout);
    }

    void print_footer() override {
        fprintf(fout, "\n]\n");
    }
};

struct markdown_printer : public printer {
    std::vector<std::string> fields;

    static int get_field_width(const std::string & field) {
        if (field == "model") {
            return -30;
        }
        if (field == "t/s") {
            return 16;
        }
        if (field == "size" || field == "params") {
            return 10;
        }
        if (field == "n_gpu_layers") {
            return 3;
        }
        if (field == "n_threads") {
            return 7;
        }
        if (field == "n_batch") {
            return 7;
        }
        if (field == "n_ubatch") {
            return 8;
        }
        if (field == "type_k" || field == "type_v") {
            return 6;
        }
        if (field == "split_mode") {
            return 5;
        }
        if (field == "flash_attn") {
            return 2;
        }
        if (field == "use_mmap") {
            return 4;
        }
        if (field == "test") {
            return 13;
        }

        int width = std::max((int)field.length(), 10);

        if (test::get_field_type(field) == test::STRING) {
            return -width;
        }
        return width;
    }

    static std::string get_field_display_name(const std::string & field) {
        if (field == "n_gpu_layers") {
            return "ngl";
        }
        if (field == "split_mode") {
            return "sm";
        }
        if (field == "n_threads") {
            return "threads";
        }
        if (field == "no_kv_offload") {
            return "nkvo";
        }
        if (field == "flash_attn") {
            return "fa";
        }
        if (field == "use_mmap") {
            return "mmap";
        }
        if (field == "embeddings") {
            return "embd";
        }
        if (field == "tensor_split") {
            return "ts";
        }
        return field;
    }

    void print_header(const cmd_params & params) override {
        // select fields to print
        fields.emplace_back("model");
        fields.emplace_back("size");
        fields.emplace_back("params");
        fields.emplace_back("backend");
        bool is_cpu_backend = test::get_backend() == "CPU" || test::get_backend() == "BLAS";
        if (!is_cpu_backend) {
            fields.emplace_back("n_gpu_layers");
        }
        if (params.n_threads.size() > 1 || params.n_threads != cmd_params_defaults.n_threads || is_cpu_backend) {
            fields.emplace_back("n_threads");
        }
        if (params.n_batch.size() > 1 || params.n_batch != cmd_params_defaults.n_batch) {
            fields.emplace_back("n_batch");
        }
        if (params.n_ubatch.size() > 1 || params.n_ubatch != cmd_params_defaults.n_ubatch) {
            fields.emplace_back("n_ubatch");
        }
        if (params.type_k.size() > 1 || params.type_k != cmd_params_defaults.type_k) {
            fields.emplace_back("type_k");
        }
        if (params.type_v.size() > 1 || params.type_v != cmd_params_defaults.type_v) {
            fields.emplace_back("type_v");
        }
        if (params.main_gpu.size() > 1 || params.main_gpu != cmd_params_defaults.main_gpu) {
            fields.emplace_back("main_gpu");
        }
        if (params.split_mode.size() > 1 || params.split_mode != cmd_params_defaults.split_mode) {
            fields.emplace_back("split_mode");
        }
        if (params.no_kv_offload.size() > 1 || params.no_kv_offload != cmd_params_defaults.no_kv_offload) {
            fields.emplace_back("no_kv_offload");
        }
        if (params.flash_attn.size() > 1 || params.flash_attn != cmd_params_defaults.flash_attn) {
            fields.emplace_back("flash_attn");
        }
        if (params.tensor_split.size() > 1 || params.tensor_split != cmd_params_defaults.tensor_split) {
            fields.emplace_back("tensor_split");
        }
        if (params.use_mmap.size() > 1 || params.use_mmap != cmd_params_defaults.use_mmap) {
            fields.emplace_back("use_mmap");
        }
        if (params.embeddings.size() > 1 || params.embeddings != cmd_params_defaults.embeddings) {
            fields.emplace_back("embeddings");
        }
        fields.emplace_back("test");
        fields.emplace_back("t/s");

        fprintf(fout, "|");
        for (const auto & field : fields) {
            fprintf(fout, " %*s |", get_field_width(field), get_field_display_name(field).c_str());
        }
        fprintf(fout, "\n");
        fprintf(fout, "|");
        for (const auto & field : fields) {
            int width = get_field_width(field);
            fprintf(fout, " %s%s |", std::string(std::abs(width) - 1, '-').c_str(), width > 0 ? ":" : "-");
        }
        fprintf(fout, "\n");
    }

    void print_test(const test & t) override {
        std::map<std::string, std::string> vmap = t.get_map();

        fprintf(fout, "|");
        for (const auto & field : fields) {
            std::string value;
            char buf[128];
            if (field == "model") {
                value = t.model_type;
            } else if (field == "size") {
                if (t.model_size < 1024*1024*1024) {
                    snprintf(buf, sizeof(buf), "%.2f MiB", t.model_size / 1024.0 / 1024.0);
                } else {
                    snprintf(buf, sizeof(buf), "%.2f GiB", t.model_size / 1024.0 / 1024.0 / 1024.0);
                }
                value = buf;
            } else if (field == "params") {
                if (t.model_n_params < 1000*1000*1000) {
                    snprintf(buf, sizeof(buf), "%.2f M", t.model_n_params / 1e6);
                } else {
                    snprintf(buf, sizeof(buf), "%.2f B", t.model_n_params / 1e9);
                }
                value = buf;
            } else if (field == "backend") {
                value = test::get_backend();
                if (t.has_rpc) {
                    value += "+RPC";
                }
            } else if (field == "test") {
                if (t.n_prompt > 0 && t.n_gen == 0) {
                    snprintf(buf, sizeof(buf), "pp%d", t.n_prompt);
                } else if (t.n_gen > 0 && t.n_prompt == 0) {
                    snprintf(buf, sizeof(buf), "tg%d", t.n_gen);
                } else {
                    snprintf(buf, sizeof(buf), "pp%d+tg%d", t.n_prompt, t.n_gen);
                }
                value = buf;
            } else if (field == "t/s") {
                snprintf(buf, sizeof(buf), "%.2f ± %.2f", t.avg_ts(), t.stdev_ts());
                value = buf;
            } else if (vmap.find(field) != vmap.end()) {
                value = vmap.at(field);
            } else {
                assert(false);
                exit(1);
            }

            int width = get_field_width(field);
            if (field == "t/s") {
                // HACK: the utf-8 character is 2 bytes
                width += 1;
            }
            fprintf(fout, " %*s |", width, value.c_str());
        }
        fprintf(fout, "\n");
    }

    void print_footer() override {
        fprintf(fout, "\nbuild: %s (%d)\n", test::build_commit.c_str(), test::build_number);
    }
};

struct sql_printer : public printer {
    static std::string get_sql_field_type(const std::string & field) {
        switch (test::get_field_type(field)) {
            case test::STRING:
                return "TEXT";
            case test::BOOL:
            case test::INT:
                return "INTEGER";
            case test::FLOAT:
                return "REAL";
            default:
                assert(false);
                exit(1);
        }
    }

    void print_header(const cmd_params & params) override {
        std::vector<std::string> fields = test::get_fields();
        fprintf(fout, "CREATE TABLE IF NOT EXISTS test (\n");
        for (size_t i = 0; i < fields.size(); i++) {
            fprintf(fout, "  %s %s%s\n", fields.at(i).c_str(), get_sql_field_type(fields.at(i)).c_str(),  i < fields.size() - 1 ? "," : "");
        }
        fprintf(fout, ");\n");
        fprintf(fout, "\n");
        (void) params;
    }

    void print_test(const test & t) override {
        fprintf(fout, "INSERT INTO test (%s) ", join(test::get_fields(), ", ").c_str());
        fprintf(fout, "VALUES (");
        std::vector<std::string> values = t.get_values();
        for (size_t i = 0; i < values.size(); i++) {
            fprintf(fout, "'%s'%s", values.at(i).c_str(), i < values.size() - 1 ? ", " : "");
        }
        fprintf(fout, ");\n");
    }
};

static void test_prompt(llama_context * ctx, int n_prompt, int n_past, int n_batch, int n_threads) {
    llama_set_n_threads(ctx, n_threads, n_threads);

    const llama_model * model = llama_get_model(ctx);
    const int32_t n_vocab = llama_n_vocab(model);

    std::vector<llama_token> tokens(n_batch);

    int n_processed = 0;

    while (n_processed < n_prompt) {
        int n_tokens = std::min(n_prompt - n_processed, n_batch);
        tokens[0] = n_processed == 0 && llama_add_bos_token(model) ? llama_token_bos(model) : std::rand() % n_vocab;
        for (int i = 1; i < n_tokens; i++) {
            tokens[i] = std::rand() % n_vocab;
        }
        llama_decode(ctx, llama_batch_get_one(tokens.data(), n_tokens, n_past + n_processed, 0));
        n_processed += n_tokens;
    }

    llama_synchronize(ctx);
}

static void test_gen(llama_context * ctx, int n_gen, int n_past, int n_threads) {
    llama_set_n_threads(ctx, n_threads, n_threads);

    const llama_model * model = llama_get_model(ctx);
    const int32_t n_vocab = llama_n_vocab(model);

    llama_token token = llama_add_bos_token(model) ? llama_token_bos(model) : std::rand() % n_vocab;

    for (int i = 0; i < n_gen; i++) {
        llama_decode(ctx, llama_batch_get_one(&token, 1, n_past + i, 0));
        llama_synchronize(ctx);
        token = std::rand() % n_vocab;
    }
}

static void llama_null_log_callback(enum ggml_log_level level, const char * text, void * user_data) {
    (void) level;
    (void) text;
    (void) user_data;
}

static std::unique_ptr<printer> create_printer(output_formats format) {
    switch (format) {
        case NONE:
            return nullptr;
        case CSV:
            return std::unique_ptr<printer>(new csv_printer());
        case JSON:
            return std::unique_ptr<printer>(new json_printer());
        case MARKDOWN:
            return std::unique_ptr<printer>(new markdown_printer());
        case SQL:
            return std::unique_ptr<printer>(new sql_printer());
    }
    GGML_ASSERT(false);
}

int main(int argc, char ** argv) {
    // try to set locale for unicode characters in markdown
    setlocale(LC_CTYPE, ".UTF-8");

#if !defined(NDEBUG)
    fprintf(stderr, "warning: asserts enabled, performance may be affected\n");
#endif

#if (defined(_MSC_VER) && defined(_DEBUG)) || (!defined(_MSC_VER) && !defined(__OPTIMIZE__))
    fprintf(stderr, "warning: debug build, performance may be affected\n");
#endif

#if defined(__SANITIZE_ADDRESS__) || defined(__SANITIZE_THREAD__)
    fprintf(stderr, "warning: sanitizer enabled, performance may be affected\n");
#endif

    cmd_params params = parse_cmd_params(argc, argv);

    // initialize llama.cpp
    if (!params.verbose) {
        llama_log_set(llama_null_log_callback, NULL);
    }
    llama_backend_init();
    llama_numa_init(params.numa);

    // initialize printer
    std::unique_ptr<printer> p = create_printer(params.output_format);
    std::unique_ptr<printer> p_err = create_printer(params.output_format_stderr);

    if (p) {
        p->fout = stdout;
        p->print_header(params);
    }

    if (p_err) {
        p_err->fout = stderr;
        p_err->print_header(params);
    }

    std::vector<cmd_params_instance> params_instances = get_cmd_params_instances(params);

    llama_model * lmodel = nullptr;
    const cmd_params_instance * prev_inst = nullptr;

    for (const auto & inst : params_instances) {
        // keep the same model between tests when possible
        if (!lmodel || !prev_inst || !inst.equal_mparams(*prev_inst)) {
            if (lmodel) {
                llama_free_model(lmodel);
            }

            lmodel = llama_load_model_from_file(inst.model.c_str(), inst.to_llama_mparams());
            if (lmodel == NULL) {
                fprintf(stderr, "%s: error: failed to load model '%s'\n", __func__, inst.model.c_str());
                return 1;
            }
            prev_inst = &inst;
        }

        llama_context * ctx = llama_new_context_with_model(lmodel, inst.to_llama_cparams());
        if (ctx == NULL) {
            fprintf(stderr, "%s: error: failed to create context with model '%s'\n", __func__, inst.model.c_str());
            llama_free_model(lmodel);
            return 1;
        }

        test t(inst, lmodel, ctx);

        llama_kv_cache_clear(ctx);

        // warmup run
        if (t.n_prompt > 0) {
            //test_prompt(ctx, std::min(t.n_batch, std::min(t.n_prompt, 32)), 0, t.n_batch, t.n_threads);
            test_prompt(ctx, t.n_prompt, 0, t.n_batch, t.n_threads);
        }
        if (t.n_gen > 0) {
            test_gen(ctx, 1, 0, t.n_threads);
        }

        for (int i = 0; i < params.reps; i++) {
            llama_kv_cache_clear(ctx);

            uint64_t t_start = get_time_ns();

            if (t.n_prompt > 0) {
                test_prompt(ctx, t.n_prompt, 0, t.n_batch, t.n_threads);
            }
            if (t.n_gen > 0) {
                test_gen(ctx, t.n_gen, t.n_prompt, t.n_threads);
            }

            uint64_t t_ns = get_time_ns() - t_start;
            t.samples_ns.push_back(t_ns);
        }

        if (p) {
            p->print_test(t);
            fflush(p->fout);
        }

        if (p_err) {
            p_err->print_test(t);
            fflush(p_err->fout);
        }

        llama_print_timings(ctx);

        llama_free(ctx);
    }

    llama_free_model(lmodel);

    if (p) {
        p->print_footer();
    }

    if (p_err) {
        p_err->print_footer();
    }

    llama_backend_free();

    return 0;
}
